﻿#region BSD 3-Clause License
/* Copyright (c) 2012, Intel Corporation
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *    
 * 3. Neither the name of Intel Corporation nor the names of its contributors may
 *    be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#endregion

using System;

namespace OpenHopla.Timing
{
    public class Timer : ITimer
    {
        private TimeSpan _initialTimeRemaining = TimeSpan.Zero;
        private Stopwatch _stopwatch = new Stopwatch();

        public Timer()
        {
        }

        public Timer(TimeSpan timeRemaining)
        {
            RemainingTime = timeRemaining;
        }

        public TimeSpan RemainingTime
        {
            get
            {
                if (_stopwatch.AccumulatedTime < _initialTimeRemaining)
                {
                    return _initialTimeRemaining - _stopwatch.AccumulatedTime;
                }
                else
                {
                    return TimeSpan.Zero;
                }
            }
            set
            {
                _initialTimeRemaining = (value < TimeSpan.Zero) ? TimeSpan.Zero : value;
            }
        }

        public void StartStop()
        {
            _stopwatch.StartStop();
        }

        public bool IsStopped
        {
            get
            {
                return _stopwatch.IsStopped;
            }
        }

        public bool IsRunning
        {
            get
            {
                return _stopwatch.IsRunning;
            }
        }
    }
}
